CN114289187B - Bauxite flotation combined collector and preparation method thereof - Google Patents
Bauxite flotation combined collector and preparation method thereof Download PDFInfo
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- CN114289187B CN114289187B CN202111639358.5A CN202111639358A CN114289187B CN 114289187 B CN114289187 B CN 114289187B CN 202111639358 A CN202111639358 A CN 202111639358A CN 114289187 B CN114289187 B CN 114289187B
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- 238000005188 flotation Methods 0.000 title claims abstract description 40
- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 150000001413 amino acids Chemical class 0.000 claims abstract description 41
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 41
- 229930195729 fatty acid Natural products 0.000 claims abstract description 41
- 239000000194 fatty acid Substances 0.000 claims abstract description 41
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 38
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 4
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical group [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 claims description 32
- -1 oleoyl amino acid Chemical class 0.000 claims description 27
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- 238000000034 method Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
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- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 31
- 239000011707 mineral Substances 0.000 abstract description 31
- 238000001179 sorption measurement Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 5
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- 239000000203 mixture Substances 0.000 description 6
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- 239000004475 Arginine Substances 0.000 description 2
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- UMOAAMQGRRCHPA-GJCOWUBNSA-N N-oleoyl-L-leucine Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)N[C@H](C(O)=O)CC(C)C UMOAAMQGRRCHPA-GJCOWUBNSA-N 0.000 description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention belongs to the technical field of mineral flotation reagents, and particularly discloses a bauxite flotation combined collector and a preparation method thereof. The combined collector provided by the invention consists of a fatty acid collector and amino acid, and is obtained by mixing and reacting the fatty acid collector and the amino acid. The components in the combined collector not only comprise the fatty acid collector and the amino acid, but also comprise reaction products of the fatty acid collector and the amino acid, and the combined collector realizes the floatation of minerals through the synergistic strengthening effect of the components, and comprises the interface regulation and control of the amino acid on the minerals, the adsorption of the amino acid and the fatty acid collector on the interfaces of the minerals, and the strengthening adsorption effect of the reaction products of the amino acid and the fatty acid collector on the minerals. The combined collector can effectively improve the recovery rate of useful minerals, reduce the content of the useful minerals in tailings, and solve the flotation problem caused by complex mineral components.
Description
Technical Field
The invention relates to the field of flotation agents, in particular to a combined collector for bauxite flotation and a preparation method thereof.
Background
The flotation technology has the characteristics of large treatment capacity, low cost, low energy consumption and the like in improving the quality of low-quality mineral resources, and has been industrially applied. However, as mineral resources are continuously consumed, the ore grade gradually decreases, and the impurity content in minerals increases, so that flotation separation faces more challenges.
The use of the collector plays a decisive role in promoting mineral flotation separation, and the collector can selectively improve the surface hydrophobicity of minerals, increase the adhesion of the minerals on bubbles and shorten the attachment time, so that the sorting property of useful minerals and gangue minerals is improved. Fatty acid type anion collectors, such as oleic acid or oleate are commonly used in bauxite flotation. The collector mainly carries out chemical adsorption on carboxyl and minerals, and has the problems of low price, low toxicity, poor selectivity, low resource recovery rate and the like. It has been found that collectors having two or more functional groups have a higher selectivity for minerals and higher collection capacity than single functional group collectors, but generally have a complicated synthesis method and high production costs.
The combined collector has remarkable effect in improving flotation efficiency, different medicament components are adsorbed on the surface of minerals, so that the hydrophilic and hydrophobic characteristics of the surfaces of the minerals can be effectively improved, and different components in the combined collector have the characteristics of changing the surface characteristics of the minerals and enhancing the surface difference between the minerals. And different active groups in the combined collector can play a role in synergistic promotion on flotation, so that mineral flotation separation is enhanced. In addition, the combined collector has the characteristics of simple preparation process and low cost. For the reasons, the novel combined collector with excellent performance stability has important significance for high-efficiency flotation and upgrading of low-quality mineral resources.
Disclosure of Invention
The invention mainly solves the technical problem of providing a combined collector which has high selectivity and strong collection performance and is suitable for bauxite flotation. The specific technical scheme is as follows:
in a first aspect, the present invention provides a bauxite flotation combined collector comprising a fatty acid based collector and an amino acid.
As a preferred embodiment of the present invention, the combined collector is prepared by a mixed reaction of a fatty acid collector and an amino acid.
In a preferred embodiment of the present invention, the molar ratio of the fatty acid collector to the amino acid is 1 (0.2 to 2), more preferably 1 (0.5 to 1.5), and still more preferably 1:1.
As a preferred embodiment of the present invention, the fatty acid collector is any one or a mixture of several of oleic acid, sodium oleate and potassium oleate.
As a preferred embodiment of the present invention, the amino acid may be a common alpha-amino acid, preferably a hydrophobic alpha-amino acid, further preferably phenylalanine.
In a second aspect, the invention provides a method for preparing a bauxite flotation combined collector, wherein the method for preparing the combined collector comprises the step of mixing the fatty acid collector and amino acid with water to prepare the combined collector.
Preferably, the mixing temperature is 5-40 ℃ and the mixing time is 30-100 min.
As a preferred embodiment of the present invention, the fatty acid collector and the amino acid are mixed with water in the following ratio: the mass of the fatty acid collector and the amino acid is 1 to 4%, preferably 2% of the total mass of the fatty acid collector, the amino acid and the water.
As a preferred embodiment of the invention, the preparation method of the combined collector further comprises the step of drying the combined collector to prepare a solid reagent.
In a third aspect, the present invention provides the use of a combined collector as described in mineral flotation separation, further preferably in bauxite flotation separation.
When the bauxite flotation combined collector provided by the invention is prepared, the fatty acid collector and the amino acid are respectively dissolved in water, and then the fatty acid collector and the amino acid are mixed to prepare a combined collector solution;
or dissolving fatty acid collector and amino acid in water to obtain combined collector solution;
the prepared combined collector solution can be further dried to obtain the combined collector solid reagent.
The bauxite flotation combined collector provided by the invention has two functions of amino acid: one of the functions is to adjust the surface potential of diasporite and silicate minerals, strengthen the adsorption of diasporite and fatty acid collector, reduce the adsorption of fatty acid collector on the surface of silicate minerals, and improve the flotation selectivity; the other function is that amino acid and fatty acid collector form dimer through hydrogen bond or electrostatic action, or the amino group of amino acid and carboxyl of fatty acid collector generate dehydration condensation reaction to form oleoyl amino acid, the oleoyl amino acid and diasporite mineral generate strong chemical or chelating adsorption, strengthen the collection of diasporite, and increase the floatation recovery rate of diasporite mineral.
The beneficial effects of the invention are as follows:
(1) Amino acid is added into the fatty acid collector, and the amino acid has the function of regulating and controlling the interface properties of diasporite and silicate minerals, so that the selectivity of the fatty acid collector to the minerals is enhanced, and meanwhile, the amino acid can react with the fatty acid collector to generate oleoyl amino acid, so that the collection of diasporite can be remarkably enhanced;
(2) The amino acid and the fatty acid collector can generate a dimer or generate oleoyl amino acid through dehydration condensation reaction under the condition of liquid phase normal temperature, the fatty acid collector, the amino acid and the oleoyl amino acid coexist in the combined collector, and the three active components have synergistic effect, so that the floatation strengthening effect of the combined collector is enhanced.
The combined collector can effectively improve the action efficiency of the collector, reduce the consumption of the collector, improve the recovery rate of useful minerals and solve the flotation problem caused by complex mineral components.
Experiments show that the combined collector is not only suitable for bauxite, but also has obvious floatation effect on other minerals.
Detailed Description
The technical scheme of the invention is described in detail through specific examples.
Examples1
In this example, the adsorption energy of 20 mixtures of α -amino acids and sodium oleate and 20 interfaces of oleoyl amino acids and diasporite (010) in aqueous phase environment was calculated using quantum chemistry and molecular dynamics methods.
The specific implementation method comprises the following steps: firstly, 20 alpha-amino acids, sodium oleate, 20 oleoyl amino acids and diasporic duralumin Dan Jingbao are subjected to structural optimization by utilizing quantum chemistry, a super cell taking a diasporic (010) surface as a cleavage surface is constructed, and the adsorption energy of the amino acids, sodium oleate, oleoyl amino acids and sodium oleate on the diasporic (010) surface is calculated by adopting molecular dynamics simulation. The specific adsorption energy calculation results are shown in Table 1.
TABLE 1
| Medicament | Adsorption energy kJ.mol -1 | Medicament | Adsorption energy kJ.mol -1 |
| Glycine+sodium oleate | -120.46 | Oleoylglycine | -159.60 |
| Alanine sodium oleate | -134.98 | Oleoylalanine | -168.65 |
| Valine + sodium oleate | -208.23 | Oleoyl valine | -192.87 |
| Leucine+sodium oleate | -219.45 | Oleoyl leucine | -200.45 |
| Isoleucine + sodium oleate | -202.32 | Oleoyl isoleucine | -189.62 |
| Phenylalanine+sodium oleate | -227.39 | Oleoyl phenylalanine | -234.14 |
| Tryptophan sodium oleate | -168.34 | Oleoyl tryptophan | -197.74 |
| Tyrosine+sodium oleate | -172.36 | Oleoyl tyrosine | -189.24 |
| Aspartic acid sodium oleate | -176.66 | Oleoyl aspartic acid | -182.59 |
| Asparagine+sodium oleate | -189.13 | Oleoyl asparagine | -201.87 |
| Glutamic acid sodium oleate | -143.12 | Oleoyl glutamic acid | -165.45 |
| Lysine and sodium oleate | -187.98 | Oleoyl lysine | -165.19 |
| Glutamine + sodium oleate | -159.12 | Oleoyl glutamine | -181.19 |
| Methionine+sodium oleate | -210.73 | Oleoyl methionine | -188.01 |
| Serine+sodium oleate | -174.88 | Oleoyl serine | -190.36 |
| Threonine + sodium oleate | -129.47 | Oleoyl threonine | -202.36 |
| Cysteine+sodium oleate | -140.24 | Oleoyl cysteine | -168.25 |
| Proline+sodium oleate | -179.65 | Oleoyl proline | -204.79 |
| Histidine + sodium oleate | -142.90 | Oleoyl histidine | -176.36 |
| Arginine+sodium oleate | -129.56 | Oleoyl arginine | -187.90 |
| Oleic acid sodium salt | -153.50 |
The adsorption energy of sodium oleate on diasporite (010) surface is 153.50 kJ.mol -1 The adsorption energy of the combined medicament of the hydrophobic amino acids valine, leucine, isoleucine, phenylalanine, methionine and sodium oleate on the surface of diasporite (010) exceeds 200 kJ.mol -1 The adsorption energy of oleoyl leucine, oleoyl phenylalanine, oleoyl asparagine, oleoyl threonine and oleoyl proline on diasporite (010) surface exceeds 200 kJ.mol -1 . Phenylalanine in combination with sodium oleate and oleoyl phenylalanine adsorption energy on diasporite (010) face is more than 200 kJ.mol -1 Is higher than the adsorption energy of sodium oleate on diasporite (010) surface.
Examples 2 to 9
Examples 2-9 below used a fatty acid/salt and amino acid combination collector for bauxite flotation, and examples 2-9 used the same raw bauxite ore with chemical composition analysis as shown in table 2.
TABLE 2
| Composition of the components | Al 2 O 3 | SiO 2 | Fe 2 O 3 | TiO 2 | K 2 O | Na 2 O | CaO | MgO | Burning loss |
| Wt％ | 56.78 | 15.58 | 6.28 | 2.71 | 1.32 | 0.13 | 0.36 | 0.38 | 12.95 |
The specific flotation method comprises the following steps: ball milling is carried out on bauxite raw ore until the granularity is 85% with 200 meshes, the ground ore pulp is transferred into a 1.5L flotation tank for flotation desilication, the pH value of the pulp is regulated to 9.5, and flotation is carried out after a collector is added, wherein the consumption of the collector is 1000g/t of the raw ore. The preparation method of the combined collector is shown in table 3.
TABLE 3 Table 3
The composition analysis was performed on the combined collector shown in table 3, and the composition of the components and the mass percentage analysis results of the combined collector are shown in table 4 below.
TABLE 4 Table 4
From the results of the mass percentages of the components of the combined collector shown in Table 3, it is understood that examples 3 to 9, except for phenylalanine and fatty acid salt, all had oleoyl amino acid salt products, and the combined collector was prepared by different methods, in which the content of oleoyl amino acid salt was different. The oleoyl amino acid salt contents in examples 4, 5, 8, and 9 were 84.2%, 90.1%, 83.1%, and 81.9%, respectively, indicating that the amino acid to fatty acid salt reaction rate was greater than 80% under this preparation condition.
Bauxite was subjected to flotation using the combined collectors shown in table 3, with one roughing mode, and the final flotation results are shown in table 5 below.
TABLE 5
From the flotation results shown in table 5, it is understood that in example 2, sodium oleate was used as a collector, the yields of the obtained flotation concentrate and tailings were 74.42% and 25.58%, respectively, and the aluminum-silicon ratios (a/S) of the obtained flotation concentrate and tailings were 5.72 and 1.54, respectively. Compared with the flotation result of the combined collector of the amino acid and the fatty acid salt in the example 2, the concentrate yield is increased, the tailing aluminum-silicon ratio (A/S) is reduced, the flotation concentrate yield obtained in the example 5 is 86.07%, and the flotation tailing aluminum-silicon ratio (A/S) is 1.13. The use of the combined collector improves the yield of the flotation concentrate, reduces the aluminum-silicon ratio (A/S) of the flotation tailings, and improves the recovery rate of aluminum oxide.
Claims (6)
1. The bauxite flotation combined collector is characterized by comprising a fatty acid collector and amino acid, wherein the preparation method of the combined collector comprises the steps of mixing the fatty acid collector and the amino acid with water to prepare the combined collector;
the fatty acid collector is sodium oleate; the combined collector contains both fatty acid collector, amino acid and oleoyl amino acid; the amino acid is phenylalanine;
the molar ratio of the sodium oleate to the phenylalanine is 1:1.
2. The combined collector of claim 1 wherein the mixing temperature is 5-40 ℃.
3. The combined collector of claim 2 wherein the fatty acid collector and amino acid are mixed with water in a feed ratio of: the mass of the fatty acid collector and the amino acid is 1-4% of the total mass of the fatty acid collector, the amino acid and the water.
4. A combined collector as claimed in claim 3 wherein the fatty acid collector and amino acid are mixed with water in a feed ratio of: the mass of the fatty acid collector and the amino acid is 2% of the total mass of the fatty acid collector, the amino acid and the water.
5. The combined collector of claim 3 or 4, wherein the method for preparing the combined collector further comprises drying the combined collector to prepare a solid reagent.
6. Use of a combined collector according to any one of claims 1 to 5 in bauxite flotation separation.
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